Let $S$ be the set of all real values of $k$ for which the system oflinear equations $x +y + z = 2$ ; $2x +y - z = 3$ ; $3x + 2y + kz = 4$ has a unique solution. Then $S$ is

  • [JEE MAIN 2018]
  • A

    an empty set

  • B

    equal to $R- \{0\}$

  • C

    equal to $\{0\}$

  • D

    equal to $R$

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